What you and most fail to realize is that you are referring to the Hebrew god. There are many other gods that are just as "real" to people as the Hebrew one.
Personally, I no longer believe in the Hebrew god or any other man made deity, however, remember that "Jehovah' isn't the only god out there. Thus, your Noah's ark story disproves "Jehovah" but not the other man made gods.
Hopefully that makes some sense. It's been a long day.